docs: def _gcs_list_keys(bucket, pattern):
    """ List all Google Cloud Storage keys in a specified bucket that match a pattern. """
    data = [{'Name': obj.metadata.name,
             'Type': obj.metadata.content_type,
             'Size': obj.metadata.size,
             'Updated': obj.metadata.updated_on}
            for obj in _gcs_get_keys(bucket, pattern)]
    return google.datalab.utils.commands.render_dictionary(data, ['Name', 'Type', 'Size', 'Updated'])